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Free Communications Using Free Radio Bands
What's in this website?
- My homemade antennas for the European Free Bands (without license) covering CB, PMR446, SRD869, WiFi 2.4 GHz
- My experiments of Long Distance Communications with Low Power Radios (QRP) over CB, PMR446 band, SRD869 band, WiFi 2.4 GHz band
- Study of homemade antennas with 4nec2 free software
CB antennas (Citizen Band, 27 MHz, max power 4.5 W = 37 dBm)
- homemade Magnetic Loop antenna
- capacitive hat for Sigma Mantova 5 antenna (done, missing photos and article)
- homemade 1/4 wave mobile antenna with magnetic base and capacitive hat (done, missing photos and article)
- homemade dummy load
What's PMR446?
PMR446 antennas (Personal Mobile Radio, 446 MHz, max power 500 mW = 27 dBm)
Simulation and study of antennas with 4nec2, radiation diagrams, gain, resonance, impedance, VSWR graphs:
- double H antenna with reflector
- 14 elements Yagi antenna optimized
- Moxon antenna
- 1/4 wave antenna for Ucom TwinTalker 3600-4700
- original spring antenna for Ucom TwinTalker 3600
Homemade antennas for PMR446:
- homemade Yagi antenna, 14 elements 13.6 dBd
- homemade Quagi antenna, 8 elements 12-13 dBd
- homemade 1/4 wave Ground Plane antenna VHF-UHF
- my early homemade PMR446 antennas
- antenna coupling (done, missing photos and article)
- my homemade UHF-SWR meter
- I have a dream: a really fantastic and a revolutionary mode of making a real DX in plain...
What's SRD869?
SRD869 antennas (SRD band, 869 MHz, max power 5 mW = 7 dBm)
- stressed dish for SRD (to be done)
Radio Modifications and Manuals
-
CB
- my Connex 3600 (done, missing photos and article)
-
PMR446
- my modified Ucom TwinTalker 3500
- my modified Ucom TwinTalker 3600
- Ucom TwinTalker 4700 & 4710
- all TwinTalker's user guides (pdf)
-
SRD869
- Alinco DJ-S800 (in italian only)
Digital modes
My Personal DX
Do It Yourself with electronic
